Hub cap for charts



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UNITED I STATES PATENT mm.

CHARLES W. PETITJ'EAN, OF UNION CITY, CONNECTICUT, M

CONNECTICUT, CORPORATION OF CONNECTICUT.

COMPANY, OF WATERBUBY,

assronoa in THE Bmsror.

mm oar FOR cmars.

Application filed February 14, 1923. Serial No. 618,910.

To all wiwm it may concern:

Be it known/that I, CHARLES W. PETIT JEAN, a citizen of the UnitedStates, and a resident of Union City, in the count of 6 New Haven andState of Connecticut, ave invented certain new and useful Improvementsin Hub Caps for Charts, of which the following is a specification.

The inventlon relates to a'retaining mem- 10 her for use in holding arecord chart of a recordin arbor.

or hub member fitting overthe ar r and a removable cap portion forholding the chart to the hub; and the invention has for its object acompact device, thereby to reduce the combined height of the base andholding cap to a minimum for fitting within a closed casing; and, also,to provide a construction whereby the said cap portion may be readilypositioned and drawn against the abutment for holding the charttherebetween, merely a partial turn of the cap being uired. This iseffected by an engagement tween multiple threads, respectively providedon a shank of the base member and the inner surface of the cap.

The invention relates, furthermore, to a construction whereby thethreads exposed so for engagement are perfect to the limit ofengagement. Moreover, the invention comprehends the rovision of meanswhereby all of the muiiiple threads will be caused to go into actionsimultaneously without dan er of the threads becoming crossed.

e nature of the invention, however, will best be understood whendescribed in connection with the accompanying drawings, in which-- 40Fig. 1 is an elevation composing the retaining member, the same beingshown in separated condition.

Fig. 2 is a vertical section thru the retaining member with therespective parts 46 in clamping position.

Similar characters of reference designate corresponding parts thruoutthe several views.

Referrin now tov the drawings, 10 desig- 50 nates a ho ow hub serving asa base or abutment member for a chart 11, said base being adapted foruse in connection with recording gages and the like and held thereto,for example b a taper fit upon a rotatable Harbor 12 of t e gage (notshown). The

gauge or the like on a rotatable of the two parts uch holders usuallyembod a base more quickly base member 10 is provided with a stem orshank having over its outer portion multiple threads 13. There isdesigned, moreover, to fit over the said shank a sleeve 14 provided witha flange 15 upon which the chart is to be supported and held, saidsleeve having a forced fit thereon and shouldering against anenlargement 16 at the one end'of the base. The sleeve 14, however, doesnot entirely cover the multiple threads, but a short portion at theouter end of the shank remains exposed; and in this manner perfectthreads may be provided to the limit of engagement at the correspondingend of the sleeve. If the base or abutment member and sleeve were madeintegral, it would be practically impossible, from a mechanicalstandoint, thus to insure perfect threads to the imit of engagement.

Moreover, to reduce the height of the base and ca members sufiicientlyso that the cover 0? the gage need not be an undue distance above thesurface of the chart, multiple threads are required; and in employingsuch multiple threads for this purpose, difliculty would be experiencedin starting a. cap memer 17 which is to hold the chart to the flange ofthe sleeve. To this end, the sleeve portion is somewhat elongated anddesigned to center the cap member which is accordingly made hollow andhas a smooth cylindrical inner portion adapted accurately to fit overthe said sleeve, and terminating in threads 18 at its outer end. Bymerely placing the cap over the sleeve, therefore, the former will thusbe accurately centered without danger of crossing of the threads so thatin rotating the cap to screw same on the base member each of theplurality of. threads is simultaneouslystarted in en agement and the capmay quickly be brougit down to the flange in view of the multiplicity ofthreads, preferably four, a partial turn merely being necessary topositively and securely lock the chart 11 in g ace. 10o Similarl apartial turn in the reverse irection wil serve to unlock the chart forremoval.

In order conveniently to cut the threads 18 of the cap 17 in themanufacture of the 105 holding member, the top is left open until thesaid threads have been cut in order to admit the proper tapping tool,whereupon a cover member 20 is placed over the opening and held to thetop of the cap by swagno ing over the edges of the cap. A hole 21 may becentrally provided therein to receive a chain 22 or the like by whichthe cap is secured to some fixed part (not shown) to prevent loss of thecap.

I claim:-

1. A chart retaining member, comprising: a base member having amultiple-threaded shank, a flanged sleeve fitting over the threadedshank to expose an outer portion thereof only, the exposed threadsremain ing perfect to the outer end of the sleeve, ahollow cap memberhaving a fiange'to cooperate with the fiange of the sleeve in holding achart and having a smooth inner-wall portion to fit over the saidsleeve, and threaded at the inner end for engagement with the multiplethreads of the shank, the sleeve centering the cap and guiding itsthreaded portion to the threads of the shank so that all will startsimultaneously as the cap is rotated.

2. A chart retaining member, comprising: a base member having amultiple-threaded shank, a flanged sleeve fitting over. the threadedshank to exposean outer portion thereof only, the exposed threadsremaining perfect to the outer end of the sleeve, a hollow cap memberhaving a flange to cooperate with the flange of the sleeve in holding achart and having a smooth inner wall portion to fit over the saidsleeve, and threaded at the inner end for engagement with the multiplethreads of the shank, the sleeve centering the cap and guiding itsthreaded portion to the threads of the shank so that all will startsimultaneously as the cap is rotated, and a cover member for the A chartretaining member, comprising: a base member havinga multiple-threadedshank, a flanged sleeve fitting over the threaded shank to expose anouter portion thereof only, the exposed threads remaining perfect to theouter end of the sleeve, a hollow cap member having a flange tocooperate with the flange of the sleeve in hol ing a chart and having asmooth inner wall portion to fit over the said sleeve, and threaded atthe inner end for engagement with the multiple threads of the shank, thesleeve centering the cap and guiding its threaded portion to the threadsof the shank so that all will start simultaneously as the cap isrotated, and a ,perforated cap and securing means passing therethru.

Signed at Waterbury in the County of New Haven and State of Connecticutthis 10th day of February A. D. 1923.

CHARLES W. PETITJEAN.

